TY  - JOUR
T1  - Phosphate rock.
CY  - Washington, D.C. :
CN  - I 28.119/2:
CN  - HD9585.P48
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. :
N1  - Description based on: 1981; title from caption.
ID  - 154634
KW  - Phosphate rock
TI  - Phosphate rock.
ER  -